createPayment.js

'use strict';

const request = require('request-promise');



const ENV = 'sandbox';

const CLIENT_ID = 'AZDxjDScFpQtjWTOUtWKbyN_bDt4OgqaF4eYXlewfBP4-8aqX3PiV8e1GWU6liB2CUXlkA59kJXE7M6R';

const PAYPAL_URL = (ENV === 'sandbox')
        ? 'https://www.sandbox.paypal.com'
        : 'https://www.paypal.com';

const PAYPAL_API = (ENV === 'sandbox')
        ? 'https://api.sandbox.paypal.com'
        : 'https://api.paypal.com';
        
const AUTH_API = `${PAYPAL_API}/v1/oauth2/token`;
const PAYMENT_API = `${PAYPAL_API}/v1/payments/payment`;
const EXPERIENCE_API = `${PAYPAL_API}/v1/payment-experience/web-profiles`;

const CHECKOUT_URL = `${PAYPAL_URL}/checkoutnow`;



function createAccessToken(clientID) {

    if (!clientID) {
        throw new Error(`Client ID not found for env: ${env}`);
    }
    
    let basicAuth = new Buffer(`${clientID}:`).toString('base64');

    return request({

        method: `post`,
        uri: AUTH_API,
        headers: {
            Authorization: `Basic ${basicAuth}`
        },
        form: {
            grant_type: `client_credentials`
        },
        json: true

    }).then(res => {

        if (res && res.error === 'invalid_client') {
            throw new Error(`Auth Api invalid ${env} client id: ${clientID}:\n\n${JSON.stringify(res, null, 4)}`);
        }

        if (!res || !res.access_token) {
            throw new Error(`Auth Api response error:\n\n${JSON.stringify(res, null, 4)}`);
        }

        return res.access_token;
    });
}

function createExperienceProfile(clientID, experience) {

    if (!clientID) {
        throw new Error(`Client ID not found for env: ${env}`);
    }

    experience.temporary = true;
    experience.name = experience.name ? `${experience.name}_${Math.random().toString()}` : Math.random().toString();

    return createAccessToken(clientID).then(accessToken => {

        return request({
            method: `post`,
            uri: EXPERIENCE_API,
            headers: {
                Authorization: `Bearer ${accessToken}`
            },
            body: experience,
            json: true
        });

    }).then(res => {

        if (res && res.error) {
            throw new Error(res.error);
        }

        if (!res.id) {
            throw new Error(`No id in experience profile response:\n\n${JSON.stringify(res, null, 4)}`);
        }

        return res.id;
    });

}

function createPayment(clientID, opts) {
    
    let payment = opts.payment;
    let experience = opts.experience;

    if (!clientID) {
        throw new Error(`Client ID not passed`);
    }
    
    if (!payment) {
        throw new Error(`Expected payment details to be passed`);
    }
    
    payment.intent = payment.intent || 'sale';
    payment.payer = payment.payer || {};
    payment.payer.payment_method = payment.payer.payment_method || 'paypal';

    return createAccessToken(clientID).then(accessToken => {

        return Promise.resolve().then(() => {

            if (experience) {
                return createExperienceProfile(clientID, experience);
            }

        }).then(experienceID => {

            if (experienceID) {
                payment.experience_profile_id = experienceID;
            }

            let headers = {
                Authorization: `Bearer ${accessToken}`
            };
            
            return request({
                method: `post`,
                uri: PAYMENT_API,
                headers,
                body: payment,
                json: true
            });
        });

    }).then(res => {

        if (res && res.id) {
            return res.id;
        }

        throw new Error(`Payment Api response error:\n\n${JSON.stringify(res, null, 4)}`);
    });
}




createPayment(CLIENT_ID, {
    
    payment: {
        transactions: [
            {
                amount: { total: '0.01', currency: 'USD' }
            }
        ],
        redirect_urls: {
            return_url: 'https://google.com',
            cancel_url: 'https://google.com'
        }
    },
    
    experience: {
        input_fields: {
            no_shipping: 1
        }
    }
    
}).then(paymentID => {
    
    console.log(`${CHECKOUT_URL}?token=${paymentID}`)
});